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Although the in depth analysis work on twin-roll strip casting course of has been carried out over the last decade, there are still some necessary issues requiring further investigation. Al-Cu eutectic alloy strip was prepared at totally different liquid soften superheat of 30 K–70 K with casting velocity zero.seventy nine m/s. Figure 6 reveals the microstructure of as-forged eutectic Al-Cu strip for different liquid soften superheat. From the microstructure it is noticed that, at low liquid melt superheat, the strip microstructure consists of darkish globular precipitates like flowery sample inside matrix of a eutectic construction.
The simulations are carried out for casting of Al-33 wt.% Cu strips having thickness of two mm in a twin-roll caster at casting speed 0.7979 m/s . Figure 5 exhibits the solidification profile of liquid Al-33 wt.% Cu in the molten pool for various pouring temperatures.
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Beyond 941 K the presence of solidified shell just isn’t noticed . The interfacial heat transfer coefficient between the rolls and the liquid steel performs a crucial role in determining the general productiveness of the TRSC course of and the quality of the product. It is desired that the rolls ought to have a high thermal conductivity worth to remove the heat from the molten steel as rapidly as potential. The floor of the rolls must be as clean as possible to attenuate the air hole formation between the initially solidified strip and the roll surface, which will enhance the warmth switch from the liquid steel to roll floor. S. Sahoo, “Effect of course of parameters on solidification of Al-33Cu strip in excessive velocity twin roll strip casting- A numerical examine,” IOP Conference Series Materials Science and Engineering, vol. B. Wang, J.-Y. Zhang, J.-F. Fan, S.-L. Zhao, S.-B. Ren, and K.-C. Chou, “Modelling of soften flow and solidification within the twin-roll strip casting course of,” Steel Research International, vol.
By increasing the roll pace, the liquid steel will get much less time to stay throughout the metal pool and the contact time between the molten metals with the roll floor is much much less. The broad difference in the cooling rate/solidification entrance velocity is expected to give rise to distinct structure within the outer layer and internal portion of the forged Al-33 wt.% Cu. By rising the casting velocity from a hundred rpm to 500 rpm the width of the lamellar structure decreases and wavy structure will increase. This is the impact of the difference within the speeds of solidification front . The free surface fluctuation causes an uneven heat switch between the liquid metals to the roll surface which causes the floor defects within the as-solid strip.
It means that these defects may be associated to move habits and surface fluctuation in molten pool between the two rolls. The authors observed that free surface fluctuations depend on the casting speed. An improve in the casting speed decreases the free … Read More